EP1439344B1 - Pig - Google Patents

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Publication number
EP1439344B1
EP1439344B1 EP20040000640 EP04000640A EP1439344B1 EP 1439344 B1 EP1439344 B1 EP 1439344B1 EP 20040000640 EP20040000640 EP 20040000640 EP 04000640 A EP04000640 A EP 04000640A EP 1439344 B1 EP1439344 B1 EP 1439344B1
Authority
EP
European Patent Office
Prior art keywords
pig
sealing lip
coating agent
main body
agent line
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP20040000640
Other languages
German (de)
French (fr)
Other versions
EP1439344A2 (en
EP1439344A3 (en
Inventor
Herbert Martin
Martin Stiegler
Werner Schwager
Andreas Collmer
Manfred Michelfelder
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Duerr Systems AG
Original Assignee
Duerr Systems AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from DE10301942A external-priority patent/DE10301942A1/en
Priority claimed from EP03010195A external-priority patent/EP1362641B1/en
Application filed by Duerr Systems AG filed Critical Duerr Systems AG
Priority to EP20040000640 priority Critical patent/EP1439344B1/en
Publication of EP1439344A2 publication Critical patent/EP1439344A2/en
Publication of EP1439344A3 publication Critical patent/EP1439344A3/en
Application granted granted Critical
Publication of EP1439344B1 publication Critical patent/EP1439344B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
    • F16L55/16—Devices for covering leaks in pipes or hoses, e.g. hose-menders
    • F16L55/162—Devices for covering leaks in pipes or hoses, e.g. hose-menders from inside the pipe
    • F16L55/164—Devices for covering leaks in pipes or hoses, e.g. hose-menders from inside the pipe a sealing fluid being introduced in the pipe
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B12/00—Arrangements for controlling delivery; Arrangements for controlling the spray area
    • B05B12/14—Arrangements for controlling delivery; Arrangements for controlling the spray area for supplying a selected one of a plurality of liquids or other fluent materials or several in selected proportions to a spray apparatus, e.g. to a single spray outlet
    • B05B12/1481—Arrangements for controlling delivery; Arrangements for controlling the spray area for supplying a selected one of a plurality of liquids or other fluent materials or several in selected proportions to a spray apparatus, e.g. to a single spray outlet comprising pigs, i.e. movable elements sealingly received in supply pipes, for separating different fluids, e.g. liquid coating materials from solvent or air
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B5/00—Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means
    • B05B5/16—Arrangements for supplying liquids or other fluent material
    • B05B5/1608—Arrangements for supplying liquids or other fluent material the liquid or other fluent material being electrically conductive
    • B05B5/1616—Arrangements for supplying liquids or other fluent material the liquid or other fluent material being electrically conductive and the arrangement comprising means for insulating a grounded material source from high voltage applied to the material

Definitions

  • the invention relates to a pig for a coating agent line in a coating installation according to the preamble of claim 1 and a production method according to claim 17.
  • Such a pig and its use are for example in DE 102 40 072 and the corresponding EP application 03 018 587.0 described.
  • On off EP 0 405 075 B1 known pig consists of a base body which is insertable into a pipeline, wherein on the lateral surface of the base body, a substantially radially projecting sealing lip is arranged, which rests in operation on the inner wall of the pipeline to be cleaned and abstreift adhering material residues.
  • a disadvantage of this known pig is the fact that the sealing lip folds in a change in the direction of movement of the pig in the axial direction, which is due to the strong deformation of the sealing lip when folded with a high degree of wear.
  • Out EP 1 172 153 A1 is a so-called double pig known that has a built-in permanent magnet as a signal generator. However, the spatial orientation of the permanent magnet in the pig is not visible from the outside.
  • the invention is therefore an object of the invention to provide a low-wear pig as possible, which can be used in a desired spatial orientation in the coating agent line.
  • the invention comprises the general technical teaching of arranging the sealing lip on the base body in such a way that, when the direction of movement of the pig is changed, it does not fold counter to the direction of movement, but remains largely dimensionally stable.
  • the sealing lip therefore preferably extends substantially axially with respect to the longitudinal axis of the coating agent line from the main body.
  • Such an arrangement and design of the sealing lip has the advantage that the forces acting on the sealing lip forces are relatively small with a change in the direction of movement of the pig and therefore do not let the sealing lip fold down.
  • the sealing lip preferably has a radial extension, which is at most 10% of the axial extent of the sealing lip, so that a folding over of the sealing lip is prevented in a change in the direction of movement of the pig in the coating medium line.
  • the maximum possible radial extent of the sealing lip depends on the rigidity of the material used for the sealing lip, the material thickness and the friction between the sealing lip and the inner wall of the coating medium line.
  • the sealing lip can protrude further outward in the radial direction without the sealing lip folding over when the direction of movement of the pig in the coating agent line changes.
  • the base body passes on its outer side substantially without offset in the sealing lip, wherein the minimum outer diameter of the body over its entire length preferably is at least 80% of the inner diameter of the coating agent line.
  • the minimum outer diameter of the body over its entire length preferably is at least 80% of the inner diameter of the coating agent line.
  • the sealing lip has a free length in the axial direction, which is at least 15% of the inner diameter of the coating agent line and / or at least 6% of the axial length of the base body.
  • the sealing lip is formed in the preferred embodiment of the sealing lip according to the invention such that the sealing lip is pressed against the inner wall of the coating agent line by the pressure of a sliding medium in the coating medium line.
  • This can be achieved in that the radially inner surface of the sealing lip extends substantially axially and is in contact with the sliding medium in the coating medium line, so that the hydrostatic pressure acting on the radially inner surface of the sealing lip in the coating medium line seals the sealing lip pressed radially outward against the inner wall of the coating medium line.
  • the sealing lip is formed such that the sealing lip is pressed against the inner wall of the coating medium line during movement of the pig in the coating medium line in the direction of the sealing lip by the frictional force acting between the sealing lip and the inner wall of the coating agent line.
  • This can be achieved by the point of contact between the sealing lip and the inner wall of the coating agent line is radially outside the lateral surface of the body, so that the friction force acting on the sealing lip generates a contact pressure, which presses the sealing lip radially outward against the inner wall of the coating medium line.
  • the actual sealing effect is preferably generated by a sealing edge, which rotates on the outside of the sealing lip with respect to the longitudinal axis of the coating agent line and rests against the inner wall of the coating agent line during operation.
  • the sealing edge on the side facing the free end of the sealing lip is preferably delimited by a transition surface which encloses an angle between 25 ° and 65 ° (based on a 360 ° full circle) with the inner wall of the coating agent line. It has proved to be particularly advantageous if this transition surface encloses an angle of approximately 45 ° with the inner wall of the coating agent line.
  • the sealing edge is preferably delimited by a transitional surface which encloses an angle between 10 ° and 60 ° with respect to the inner wall of the coating agent line (based on a 360 ° full circle), with a value of about 30 ° has proved to be particularly advantageous.
  • the stop buffer consists of a cylindrical projection, which is preferably arranged centrally on one or both end sides of the base body.
  • a signal generator is arranged in the base body, which may for example consist of a permanent magnet, a steel core or other permanent magnetic material and allows monitoring of the position of the pig by a separate pig sensor during operation.
  • the main body is in this case integrally formed around the signal body, so that the main body hermetically encloses the signal generator.
  • the body can be molded on the signal transmitter, molded or foamed.
  • the main body, the sealing lip and / or the stop buffer preferably consists of a water-resistant and / or a solvent-resistant material, preferably an elastomer is used.
  • a palpable and / or visible marking is formed on the base body and / or on the stop buffer, which indicates the spatial orientation of the signal generator in the base body, so that the pig can be used in the desired spatial orientation in the coating agent line.
  • the invention comprises not only a pig as a single part, but also a coating plant with such a pig and a manufacturing method for a pig according to the invention.
  • FIG. 1 shows a pig 1, which can be used in a coating system for the series coating of motor vehicle body parts, in order to free the inner wall of the coating agent lines in a color change of adhering coating agent residues.
  • the pig 1 consists essentially of an approximately cylindrical base body 2 and arranged in the body 2 signal generator 3, which consists of a permanent magnet and allows monitoring of the position of the pig 1 in the coating medium line.
  • the base body 2 in this case consists of an elastomer and is molded by an injection molding outside of the signal generator 3 or molded.
  • the sealing lips 4, 5 prevents the sealing lips 4, 5 can fold down due to the forces acting between the sealing lips 4, 5 and the inner wall of the coating agent line 22 frictional forces.
  • the service life of the pig 1 according to the invention is substantially increased, since the strong deformation associated with a folding over of the sealing lips 4, 5 would lead to high wear.
  • the actual sealing effect is in this case generated by a respective sealing edge 6, 7, which is arranged on the outside of the sealing lip 4, 5 and rotates over the circumference of the sealing lip, wherein the sealing edges 6, 7 abut in operation on the inner wall of the coating agent line.
  • the sealing edges 6, 7 are bounded by a transition surface 8, 9, which encloses an angle of approximately 45 ° with the inner wall of the coating medium line and with the longitudinal axis of the pig 1.
  • the sealing edges 6, 7 on the other hand limited by a transition surface 10, 11, which forms an angle of about 30 ° with the inner wall of the coating medium line and with the longitudinal axis of the pig.
  • the pig 1 on both sides in each case a stop buffer 12, 13, wherein the two stop buffers 12, 13 are arranged centrally with respect to the longitudinal axis of the pig 1 and consist of a cylindrical projection which projects in the axial direction via sealing lips 4 and 5 respectively , This prevents a collision of the pig 1 with another pig or a boundary surface that the sealing lips 4, 5 are damaged.
  • a sichtund palpable marking 14 is formed in the form of a survey, which indicates the spatial orientation of the signal generator 3 within the pig 1.
  • the pig 1 can always be used in the desired spatial orientation in a coating agent line.
  • Fig. 2 shows the pig 20 inserted in the coating agent line 22 and its base body 24 with the generally frusto-conical, annular projecting sealing lips 26 on the opposite ends of the body and with the cross-sectionally triangular rib-like from the sealing lips close to the lip ends radially outwardly projecting sealing edges 28.
  • Der Pig may consist of an elastic polymer, for example of polyethylene.
  • the outer diameter of the sealing lips is at least equal to or preferably slightly greater than the inner diameter of the conduit 22 so that the sealing lips 26 can strip the inner surface of the conduit 22 as the pig is moved through the conduit.
  • the serving as a stop buffer cylindrical end body 30 have in the example shown flat flat end surfaces 32.
  • the sealing lips 26 form with the end bodies 30 annular, axially outwardly slightly widening cavities 34 in which the pig can be acted upon by a sliding medium. Furthermore, the pig contains a sensor element 36, for example, as the signal generator 3 ( Fig. 1 ) serving magnet and the accurate determination of the location of the pig 20 in the conduit 22 allows.
  • a sensor element 36 for example, as the signal generator 3 ( Fig. 1 ) serving magnet and the accurate determination of the location of the pig 20 in the conduit 22 allows.
  • the coating agent line 22 is preferably multi-layered. Its inner layer 38 is preferably made of a smooth, friction-resistant polymer such as a perfluoroalkoxy resin.
  • the intermediate layer 40 is made of insulating plastic such as polyethylene, to prevent flashovers.
  • the outer layer 42 is preferably relatively thin and forms an outer protective layer of the conduit 22, for example of polyamide.
  • the line 22 can be made, for example, by co-extrusion of its layers, thereby achieving a close bond between the layers and peeling is avoided when using the line.
  • the conduit 22 is preferably relatively flexible. Further, it is preferably transparent or translucent so that during operation the movement of the pigs or of paint or solvent through the conduit can be visually tracked.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Coating Apparatus (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)

Description

Die Erfindung betrifft einen Molch für eine Beschichtungsmittelleitung in einer Beschichtungsanlage gemäß dem Oberbegriff des Anspruchs 1 und ein Herstellungsverfahren gemäß Anspruch 17.The invention relates to a pig for a coating agent line in a coating installation according to the preamble of claim 1 and a production method according to claim 17.

In modernen Beschichtungsanlagen für die Serienbeschichtung von Bauteilen wie z.B. Fahrzeugkarossen werden Molche eingesetzt, um Beschichtungsmittelleitungen u.a. bei einem Farbwechsel von Beschichtungsmittelresten zu reinigen, die an der Innenwand der Beschichtungsmittelleitungen anhaften, oder um Beschichtungs- und/oder Reinigungsmaterial durch die Leitung zu fördern.In modern coating systems for the series coating of components such. Vehicle bodies are used by pigs to coat coating lines and the like. in the event of a color change, of coating agent residues which adhere to the inner wall of the coating agent lines or to convey coating and / or cleaning material through the conduit.

Ein derartiger Molch und seine Verwendung sind beispielsweise in DE 102 40 072 und der entsprechenden EP-Anmeldung 03 018 587.0 beschrieben.Such a pig and its use are for example in DE 102 40 072 and the corresponding EP application 03 018 587.0 described.

Ein aus EP 0 405 075 B1 bekannter Molch besteht aus einem Grundkörper, der in eine Rohrleitung einsetzbar ist, wobei an der Mantelfläche des Grundkörpers eine im Wesentlichen radial abstehende Dichtlippe angeordnet ist, die im Betrieb an der Innenwand der zu reinigenden Rohrleitung anliegt und daran anhaftende Materialreste abstreift. Nachteilig an diesem bekannten Molch ist die Tatsache, dass die Dichtlippe bei einer Änderung der Bewegungsrichtung des Molchs in axialer Richtung umklappt, was aufgrund der starken Deformation der Dichtlippe beim Umklappen mit einem hohen Verschleiß verbunden ist.On off EP 0 405 075 B1 known pig consists of a base body which is insertable into a pipeline, wherein on the lateral surface of the base body, a substantially radially projecting sealing lip is arranged, which rests in operation on the inner wall of the pipeline to be cleaned and abstreift adhering material residues. A disadvantage of this known pig is the fact that the sealing lip folds in a change in the direction of movement of the pig in the axial direction, which is due to the strong deformation of the sealing lip when folded with a high degree of wear.

Aus EP 1 172 153 A1 ist ein sogenannter Doppelmolch bekannt, der als Signalgeber einen integrierten Permanentmagneten aufweist. Die räumliche Orientierung des Permanentmagneten in dem Molch ist hierbei jedoch von außen nicht erkennbar.Out EP 1 172 153 A1 is a so-called double pig known that has a built-in permanent magnet as a signal generator. However, the spatial orientation of the permanent magnet in the pig is not visible from the outside.

Weitere Ausführungsbeispiele von Molchen sind aus US 4 638 278 , EP 0 888 825 A2 , DE 35 11 260 und EP 1 108 475 A2 bekannt.Further embodiments of pigs are made U.S. 4,638,278 . EP 0 888 825 A2 . DE 35 11 260 and EP 1 108 475 A2 known.

Der Erfindung liegt somit die Aufgabe zugrunde, einen möglichst verschleißarmen Molch zu schaffen, der in einer gewünschten räumlichen Orientierung in die Beschichtungsmittelleitung eingesetzt werden kann.The invention is therefore an object of the invention to provide a low-wear pig as possible, which can be used in a desired spatial orientation in the coating agent line.

Diese Aufgabe wird, ausgehend von einem Molch gemäß dem Oberbegriff des Anspruchs 1, durch die kennzeichnenden Merkmale des Anspruchs 1 gelöst.This object is achieved on the basis of a pig according to the preamble of claim 1 by the characterizing features of claim 1.

Die Erfindung umfasst die allgemeine technische Lehre, die Dichtlippe so an dem Grundkörper anzuordnen, dass diese bei einer Änderung der Bewegungsrichtung des Molchs nicht entgegen der Bewegungsrichtung umklappt, sondern weitgehend formstabil bleibt.The invention comprises the general technical teaching of arranging the sealing lip on the base body in such a way that, when the direction of movement of the pig is changed, it does not fold counter to the direction of movement, but remains largely dimensionally stable.

Die Dichtlippe erstreckt sich deshalb vorzugsweise bezüglich der Längsachse der Beschichtungsmittelleitung im Wesentlichen axial von dem Grundkörper. Eine derartige Anordnung und Gestaltung der Dichtlippe bietet den Vorteil, dass die auf die Dichtlippe wirkenden Kräfte bei einer Änderung der Bewegungsrichtung des Molchs relativ gering sind und die Dichtlippe deshalb nicht umklappen lassen.The sealing lip therefore preferably extends substantially axially with respect to the longitudinal axis of the coating agent line from the main body. Such an arrangement and design of the sealing lip has the advantage that the forces acting on the sealing lip forces are relatively small with a change in the direction of movement of the pig and therefore do not let the sealing lip fold down.

Die Dichtlippe weist deshalb vorzugsweise eine radiale Erstreckung auf, die höchstens 10% der axialen Erstreckung der Dichtlippe beträgt, damit ein Umklappen der Dichtlippe bei einer Änderung der Bewegungsrichtung des Molchs in der Beschichtungsmittelleitung verhindert wird. Die maximal mögliche radiale Erstreckung der Dichtlippe hängt jedoch von der Steifigkeit des für die Dichtlippe verwendeten Materials, der Materialstärke und der Reibung zwischen der Dichtlippe und der Innenwand der Beschichtungsmittelleitung ab. So kann die Dichtlippe bei einem relativ starren Material in radialer Richtung weiter nach außen ragen, ohne dass die Dichtlippe bei einer Änderung der Bewegungsrichtung des Molchs in der Beschichtungsmittelleitung umklappt.Therefore, the sealing lip preferably has a radial extension, which is at most 10% of the axial extent of the sealing lip, so that a folding over of the sealing lip is prevented in a change in the direction of movement of the pig in the coating medium line. However, the maximum possible radial extent of the sealing lip depends on the rigidity of the material used for the sealing lip, the material thickness and the friction between the sealing lip and the inner wall of the coating medium line. Thus, with a relatively rigid material, the sealing lip can protrude further outward in the radial direction without the sealing lip folding over when the direction of movement of the pig in the coating agent line changes.

Vorzugsweise geht der Grundkörper an seiner Außenseite im Wesentlichen absatzlos in die Dichtlippe über, wobei der minimale Außendurchmesser des Grundkörpers über seine gesamte Länge vorzugsweise mindestens 80% des Innendurchmessers der Beschichtungsmittelleitung beträgt. Dadurch wird ein Umklappen der Dichtlippe bei einer Änderung der Bewegungsrichtung des Molchs in der Beschichtungsmittelleitung verhindert, da zwischen der Mantelfläche des Grundkörpers und der Innenwand der Beschichtungsmittelleitung kein ausreichender Freiraum verbleibt. Zugleich wird optimale Abstreifwirkung erreicht.Preferably, the base body passes on its outer side substantially without offset in the sealing lip, wherein the minimum outer diameter of the body over its entire length preferably is at least 80% of the inner diameter of the coating agent line. As a result, a folding over of the sealing lip is prevented in the case of a change in the direction of movement of the pig in the coating agent line, since sufficient free space does not remain between the jacket surface of the base body and the inner wall of the coating agent line. At the same time optimum stripping effect is achieved.

In einem bevorzugten Ausführungsbeispiel der Erfindung weist die Dichtlippe eine freie Länge in axialer Richtung auf, die mindestens 15% des Innendurchmessers der Beschichtungsmittelleitung und/oder mindestens 6% der axialen Länge des Grundkörpers beträgt.In a preferred embodiment of the invention, the sealing lip has a free length in the axial direction, which is at least 15% of the inner diameter of the coating agent line and / or at least 6% of the axial length of the base body.

Weiterhin ist die Dichtlippe bei dem bevorzugten Ausführungsbeispiel der erfindungsgemäßen Dichtlippe derart ausgebildet, dass die Dichtlippe durch den Druck eines in der Beschichtungsmittelleitung befindlichen Schiebemediums gegen die Innenwand der Beschichtungsmittelleitung gedrückt wird. Dies kann dadurch erreicht werden, dass sich die radial innen liegende Oberfläche der Dichtlippe im Wesentlichen axial erstreckt und in Kontakt mit dem in der Beschichtungsmittelleitung befindlichen Schiebemedium steht, so dass der auf die radial innen liegende Oberfläche der Dichtlippe wirkende hydrostatische Druck in der Beschichtungsmittelleitung die Dichtlippe radial nach außen gegen die Innenwand der Beschichtungsmittelleitung drückt.Furthermore, the sealing lip is formed in the preferred embodiment of the sealing lip according to the invention such that the sealing lip is pressed against the inner wall of the coating agent line by the pressure of a sliding medium in the coating medium line. This can be achieved in that the radially inner surface of the sealing lip extends substantially axially and is in contact with the sliding medium in the coating medium line, so that the hydrostatic pressure acting on the radially inner surface of the sealing lip in the coating medium line seals the sealing lip pressed radially outward against the inner wall of the coating medium line.

Ferner ist die Dichtlippe bei dem bevorzugten Ausführungsbeispiel derart ausgebildet, dass die Dichtlippe bei einer Bewegung des Molchs in der Beschichtungsmittelleitung in Richtung der Dichtlippe durch die zwischen der Dichtlippe und der Innenwand der Beschichtungsmittelleitung wirkende Reibungskraft gegen die Innenwand der Beschichtungsmittelleitung gedrückt wird. Dies kann dadurch erreicht werden, dass der Berührungspunkt zwischen der Dichtlippe und der Innenwand der Beschichtungsmittelleitung radial außerhalb der Mantelfläche des Grundkörpers liegt, so dass die auf die Dichtlippe wirkende Reibungskraft ein Anpressmoment erzeugt, welches die Dichtlippe radial nach außen gegen die Innenwand der Beschichtungsmittelleitung drückt.Further, in the preferred embodiment, the sealing lip is formed such that the sealing lip is pressed against the inner wall of the coating medium line during movement of the pig in the coating medium line in the direction of the sealing lip by the frictional force acting between the sealing lip and the inner wall of the coating agent line. This can be achieved by the point of contact between the sealing lip and the inner wall of the coating agent line is radially outside the lateral surface of the body, so that the friction force acting on the sealing lip generates a contact pressure, which presses the sealing lip radially outward against the inner wall of the coating medium line.

Die eigentliche Dichtwirkung wird vorzugsweise durch eine Dichtkante erzeugt, die auf der Außenseite der Dichtlippe bezüglich der Längsachse der Beschichtungsmittelleitung umläuft und im Betrieb an der Innenwand der Beschichtungsmittelleitung anliegt.The actual sealing effect is preferably generated by a sealing edge, which rotates on the outside of the sealing lip with respect to the longitudinal axis of the coating agent line and rests against the inner wall of the coating agent line during operation.

Vorzugsweise wird die Dichtkante auf der dem freien Ende der Dichtlippe zugewandten Seite von einer Übergangsfläche begrenzt, die mit der Innenwand der Beschichtungsmittelleitung einen Winkel zwischen 25° und 65° (bezogen auf einen Vollkreis mit 360°) einschließt. Als besonders vorteilhaft hat es sich erwiesen, wenn diese Übergangsfläche mit der Innenwand der Beschichtungsmittelleitung einen Winkel von etwa 45° einschließt.The sealing edge on the side facing the free end of the sealing lip is preferably delimited by a transition surface which encloses an angle between 25 ° and 65 ° (based on a 360 ° full circle) with the inner wall of the coating agent line. It has proved to be particularly advantageous if this transition surface encloses an angle of approximately 45 ° with the inner wall of the coating agent line.

Auf der dem freien Ende der Dichtlippe abgewandten Seite wird die Dichtkante vorzugsweise von einer Übergangsfläche begrenzt, die mit der Innenwand der Beschichtungsmittelleitung einen Winkel zwischen 10° und 60° (bezogen auf einen Vollkreis mit 360°) einschließt, wobei sich ein Wert von etwa 30° als besonders vorteilhaft erwiesen hat.On the side facing away from the free end of the sealing lip, the sealing edge is preferably delimited by a transitional surface which encloses an angle between 10 ° and 60 ° with respect to the inner wall of the coating agent line (based on a 360 ° full circle), with a value of about 30 ° has proved to be particularly advantageous.

In einer vorteilhaften Variante der Erfindung weist der Molch an mindestens einer seiner beiden Stirnseiten einen Anschlagpuffer auf, der axial über die Dichtlippe hinausragt, um bei einem Anstoßen des Molchs an einem anderen Molch oder an einem Anschlag eine Beschädigung der Dichtlippe zu verhindern. Vorzugsweise besteht der Anschlagpuffer aus einem zylindrischen Vorsprung, der vorzugsweise mittig an einer oder beiden Stirnseiten des Grundkörpers angeordnet ist.In an advantageous variant of the invention, the pig on at least one of its two end faces on a stop buffer, which projects axially beyond the sealing lip to prevent damage to the sealing lip upon abutment of the pig on another pig or on a stop. Preferably, the stop buffer consists of a cylindrical projection, which is preferably arranged centrally on one or both end sides of the base body.

Bei dem bevorzugten Ausführungsbeispiel der Erfindung ist in dem Grundkörper ein Signalgeber angeordnet, der beispielsweise aus einem Permanentmagneten, einem Stahlkern oder einem anderen permanentmagnetischen Werkstoff bestehen kann und im Betrieb eine Überwachung der Position des Molchs durch einen separaten Molchsensor ermöglicht. Der Grundkörper ist hierbei einstückig um den Signalkörper herum angeformt, so dass der Grundkörper den Signalgeber hermetisch einschließt. Beispielsweise kann der Grundkörper an dem Signalgeber angespritzt, angegossen oder angeschäumt werden.In the preferred embodiment of the invention, a signal generator is arranged in the base body, which may for example consist of a permanent magnet, a steel core or other permanent magnetic material and allows monitoring of the position of the pig by a separate pig sensor during operation. The main body is in this case integrally formed around the signal body, so that the main body hermetically encloses the signal generator. For example, the body can be molded on the signal transmitter, molded or foamed.

Weiterhin ist zu bemerken, dass der Grundkörper, die Dichtlippe und/oder der Anschlagpuffer vorzugsweise aus einem wasserlackbeständigen und/oder einem lösemittelbeständigen Material besteht, wobei vorzugsweise ein Elastomer Anwendung findet.Furthermore, it should be noted that the main body, the sealing lip and / or the stop buffer preferably consists of a water-resistant and / or a solvent-resistant material, preferably an elastomer is used.

Ferner ist an dem Grundkörper und/oder an dem Anschlagpuffer eine tastbare und/oder sichtbare Markierung angeformt, welche die räumliche Ausrichtung des Signalgebers in dem Grundkörper anzeigt, damit der Molch in der gewünschten räumlichen Orientierung in die Beschichtungsmittelleitung eingesetzt werden kann.Furthermore, a palpable and / or visible marking is formed on the base body and / or on the stop buffer, which indicates the spatial orientation of the signal generator in the base body, so that the pig can be used in the desired spatial orientation in the coating agent line.

Darüber hinaus umfasst die Erfindung nicht nur einen Molch als Einzelteil, sondern auch eine Beschichtungsanlage mit einem derartigen Molch sowie ein Herstellungsverfahren für einen erfindungsgemäßen Molch.In addition, the invention comprises not only a pig as a single part, but also a coating plant with such a pig and a manufacturing method for a pig according to the invention.

Andere Weiterbildungen der Erfindung sind in den Unteransprüchen gekennzeichnet oder werden nachstehend zusammen mit der Beschreibung des bevorzugten Ausführungsbeispiels der Erfindung anhand der Zeichnung näher erläutert. Es zeigen:

Fig. 1
eine Querschnittsansicht eines erfindungsgemäßen Molchs;
Fig. 2
teilweise im Querschnitt eine Beschichtungsmittelleitung mit dem hier beschriebenen Molch;
Fig. 3
einen Querschnitt durch Fig. 2 längs der Ebene III-III; und
Fig. 4
eine auseinandergezogene Ansicht des Molches und der' Beschichtungsmittelleitung.
Other embodiments of the invention are characterized in the subclaims or will be described below together with the description of the preferred embodiment of the invention explained in more detail with reference to the drawing. Show it:
Fig. 1
a cross-sectional view of a pig according to the invention;
Fig. 2
partly in cross-section, a coating agent line with the pig described here;
Fig. 3
a cross section through Fig. 2 along the level III-III; and
Fig. 4
an exploded view of the pig and the 'coating agent line.

Die Querschnittsansicht in Figur 1 zeigt einen Molch 1, der in einer Beschichtungsanlage zur Serienbeschichtung von Kraftfahrzeugkarosserieteilen eingesetzt werden kann, um die Innenwand der Beschichtungsmittelleitungen bei einem Farbwechsel von anhaftenden Beschichtungsmittelresten zu befreien.The cross-sectional view in FIG. 1 shows a pig 1, which can be used in a coating system for the series coating of motor vehicle body parts, in order to free the inner wall of the coating agent lines in a color change of adhering coating agent residues.

Der Molch 1 besteht im Wesentlichen aus einem näherungsweise zylindrischen Grundkörper 2 und einem in dem Grundkörper 2 angeordneten Signalgeber 3, der hier aus einem Permanentmagneten besteht und eine Überwachung der Position des Molchs 1 in der Beschichtungsmittelleitung ermöglicht.The pig 1 consists essentially of an approximately cylindrical base body 2 and arranged in the body 2 signal generator 3, which consists of a permanent magnet and allows monitoring of the position of the pig 1 in the coating medium line.

Der Grundkörper 2 besteht hierbei aus einem Elastomer und ist durch einen Spritzgussvorgang außen an den Signalgeber 3 angegossen bzw. umspritzt.The base body 2 in this case consists of an elastomer and is molded by an injection molding outside of the signal generator 3 or molded.

Weiterhin weist der Molch 1 beidseitig Dichtlippen 4, 5 auf, die sich vom Umfangsrand des Grundkörpers 2 ausgehend axial nach außen erstrecken, wobei der Grundkörper 2 an seiner Außenseite im Wesentlichen absatzlos in die Dichtlippen 4, 5 übergeht. Durch diese Anordnung und Gestaltung der Dichtlippen 4, 5 wird verhindert, dass die Dichtlippen 4, 5 aufgrund der zwischen den Dichtlippen 4, 5 und der Innenwand der Beschichtungsmittelleitung 22 wirkenden Reibungskräfte umklappen können. Dadurch wird die Standzeit des erfindungsgemäßen Molchs 1 wesentlich erhöht, da die mit einem Umklappen der Dichtlippen 4, 5 verbundene starke Deformation zu einem hohen Verschleiß führen würde.Furthermore, the pig 1 on both sides of sealing lips 4, 5, which extend from the peripheral edge of the base body 2, starting axially outwardly, wherein the base body 2 on its outer side passes substantially without offset in the sealing lips 4, 5. By this arrangement and design of the sealing lips 4, 5 prevents the sealing lips 4, 5 can fold down due to the forces acting between the sealing lips 4, 5 and the inner wall of the coating agent line 22 frictional forces. As a result, the service life of the pig 1 according to the invention is substantially increased, since the strong deformation associated with a folding over of the sealing lips 4, 5 would lead to high wear.

Die eigentliche Dichtwirkung wird hierbei durch jeweils eine Dichtkante 6, 7 erzeugt, die an der Außenseite der Dichtlippe 4, 5 angeordnet ist und über den Umfang der Dichtlippe umläuft, wobei die Dichtkanten 6, 7 im Betrieb an der Innenwand der Beschichtungsmittelleitung anliegen.The actual sealing effect is in this case generated by a respective sealing edge 6, 7, which is arranged on the outside of the sealing lip 4, 5 and rotates over the circumference of the sealing lip, wherein the sealing edges 6, 7 abut in operation on the inner wall of the coating agent line.

Auf der ihrem freien Ende zugewandten Seite sind die Dichtkanten 6, 7 durch eine Übergangsfläche 8, 9 begrenzt, die mit der Innenwand der Beschichtungsmittelleitung sowie mit der Längsachse des Molchs 1 einen Winkel von etwa 45° einschließt.On the side facing the free end, the sealing edges 6, 7 are bounded by a transition surface 8, 9, which encloses an angle of approximately 45 ° with the inner wall of the coating medium line and with the longitudinal axis of the pig 1.

Auf der ihrem freien Ende abgewandten Seite sind die Dichtkanten 6, 7 dagegen von einer Übergangsfläche 10, 11 begrenzt, die mit der Innenwand der Beschichtungsmittelleitung und mit der Längsachse des Molchs einen Winkel von etwa 30° einschließt.On the side facing away from its free end, the sealing edges 6, 7 on the other hand limited by a transition surface 10, 11, which forms an angle of about 30 ° with the inner wall of the coating medium line and with the longitudinal axis of the pig.

Darüber hinaus weist der Molch 1 beidseitig jeweils einen Anschlagpuffer 12, 13 auf, wobei die beiden Anschlagpuffer 12, 13 bezüglich der Längsachse des Molchs 1 mittig angeordnet sind und aus einem zylindrischen Vorsprung bestehen, der jeweils in axialer Richtung über Dichtlippen 4 bzw. 5 hinausragt. Dadurch wird bei einem Zusammenstoß des Molchs 1 mit einem anderen Molche oder einer Begrenzungsfläche verhindert, dass die Dichtlippen 4, 5 beschädigt werden.In addition, the pig 1 on both sides in each case a stop buffer 12, 13, wherein the two stop buffers 12, 13 are arranged centrally with respect to the longitudinal axis of the pig 1 and consist of a cylindrical projection which projects in the axial direction via sealing lips 4 and 5 respectively , This prevents a collision of the pig 1 with another pig or a boundary surface that the sealing lips 4, 5 are damaged.

Auf der Mantelfläche des Vorsprungs 13 ist hierbei eine sichtund tastbare Markierung 14 in Form einer Erhebung angeformt, welche die räumliche Orientierung des Signalgebers 3 innerhalb des Molchs 1 anzeigt. Auf diese Weise kann der Molch 1 stets in der gewünschten räumlichen Orientierung in eine Beschichtungsmittelleitung eingesetzt werden.On the lateral surface of the projection 13 in this case a sichtund palpable marking 14 is formed in the form of a survey, which indicates the spatial orientation of the signal generator 3 within the pig 1. In this way, the pig 1 can always be used in the desired spatial orientation in a coating agent line.

Fig. 2 zeigt den in die Beschichtungsmittelleitung 22 eingesetzten Molch 20 und dessen Grundkörper 24 mit den allgemein kegelstumpfförmigen, ringförmig vorkragenden Dichtlippen 26 auf den entgegengesetzten Enden des Grundkörpers und mit den im Querschnitt dreieckigen rippenartig von den Dichtlippen nahe an den Lippenenden radial nach außen vorspringenden Dichtkanten 28. Der Molch kann aus einem elastischen Polymer bestehen, beispielsweise aus Polyethylen. Der Außendurchmesser der Dichtlippen ist mindestens gleich oder vorzugsweise etwas größer als der Innendurchmesser der Leitung 22, so dass die Dichtlippen 26 die Innenfläche der Leitung 22 abstreifen können, wenn der Molch durch die Leitung bewegt wird. Die als Anschlagpuffer dienenden zylindrischen Endkörper 30 haben bei dem dargestellten Beispiel flache ebene Endflächen 32. Die Dichtlippen 26 bilden mit den Endkörpern 30 ringförmige, sich axial nach außen etwas erweiternde Hohlräume 34, in denen der Molch von einem Schiebemedium beaufschlagt werden kann. Ferner enthält der Molch ein Sensorelement 36, das beispielsweise der als Signalgeber 3 (Fig. 1) dienende Magnet sein kann und die genaue Bestimmung des Ortes des Molches 20 in der Leitung 22 ermöglicht. Fig. 2 shows the pig 20 inserted in the coating agent line 22 and its base body 24 with the generally frusto-conical, annular projecting sealing lips 26 on the opposite ends of the body and with the cross-sectionally triangular rib-like from the sealing lips close to the lip ends radially outwardly projecting sealing edges 28. Der Pig may consist of an elastic polymer, for example of polyethylene. The outer diameter of the sealing lips is at least equal to or preferably slightly greater than the inner diameter of the conduit 22 so that the sealing lips 26 can strip the inner surface of the conduit 22 as the pig is moved through the conduit. The serving as a stop buffer cylindrical end body 30 have in the example shown flat flat end surfaces 32. The sealing lips 26 form with the end bodies 30 annular, axially outwardly slightly widening cavities 34 in which the pig can be acted upon by a sliding medium. Furthermore, the pig contains a sensor element 36, for example, as the signal generator 3 ( Fig. 1 ) serving magnet and the accurate determination of the location of the pig 20 in the conduit 22 allows.

Die Beschichtungsmittelleitung 22 ist vorzugsweise mehrlagig. Ihre Innenlage 38 besteht vorzugsweise aus einem glatten, reibungsfesten Polymer wie z.B. einem Perfluoralkoxyharz. Die Zwischenlage 40 besteht aus isolierendem Kunststoff wie z.B. Polyethylen, um Spannungsüberschläge zu verhindern. Die Außenlage 42 ist vorzugsweise relativ dünn und bildet eine äußere Schutzschicht der Leitung 22 beispielsweise aus Polyamid. Die Leitung 22 kann beispielsweise durch Koextrusion ihrer Lagen hergestellt werden, wodurch eine enge Bindung zwischen den Lagen erreicht und ein Ablösen bei Verwendung der Leitung vermieden wird. Die Leitung 22 ist vorzugsweise relativ flexibel. Ferner ist sie vorzugsweise transparent oder durchscheinend, damit während des Betriebes die Bewegung der Molche oder von Farbe oder Lösemittel durch die Leitung visuell verfolgt werden kann.The coating agent line 22 is preferably multi-layered. Its inner layer 38 is preferably made of a smooth, friction-resistant polymer such as a perfluoroalkoxy resin. The intermediate layer 40 is made of insulating plastic such as polyethylene, to prevent flashovers. The outer layer 42 is preferably relatively thin and forms an outer protective layer of the conduit 22, for example of polyamide. The line 22 can be made, for example, by co-extrusion of its layers, thereby achieving a close bond between the layers and peeling is avoided when using the line. The conduit 22 is preferably relatively flexible. Further, it is preferably transparent or translucent so that during operation the movement of the pigs or of paint or solvent through the conduit can be visually tracked.

Claims (17)

  1. A pig (1) for a coating agent line in a coating installation, having a main body (2) insertable into the coating agent line (22) and having at least one sealing lip (4, 5) resting against the inner wall of the coating agent line in operation, and having a signal transmitter (3) arranged in the main body (2), the sealing lip (4, 5) extending substantially axially from the main body (2) relative to the longitudinal axis of the coating agent line and the main body being formed in one-piece on the signal transmitter (3), the main body (2) being formed in one-piece around the signal transmitter (3) such that the main body (2) encloses the signal transmitter (3) hermetically, characterised in that a tactile and/or visible marker (14) is formed on the main body (2) and/or on a stop buffer (12, 13), which marker indicates the spatial orientation of the signal transmitter in the main body (2).
  2. The pig (1) according to claim 1, characterised in that at its outside the main body (2) develops substantially steplessly into the sealing lip (4, 5).
  3. The pig (1) according to at least one of the preceding claims, characterised in that the sealing lip (4, 5) is configured such that on movement of the pig (1) in the coating agent line in the direction of the sealing lip (4, 5) the sealing lip (4, 5) remains substantially dimensionally stable despite the frictional force acting between the sealing lip (4, 5) and the inner wall of the coating agent line.
  4. The pig (1) according to at least one of the preceding claims, characterised in that the minimum external diameter of the main body (2) amounts to at least 80% of the internal diameter of the coating agent line.
  5. The pig (1) according to at least one of the preceding claims, characterised in that the sealing lip (4, 5) has a free length in the axial direction which amounts to at least 15% of the internal diameter of the coating agent line and/or at least 6% of the axial length of the main body (2).
  6. The pig (1) according to at least one of the preceding claims, characterised in that the sealing lip (4, 5) has a sealing edge (6, 7) on the outside which is circumferential relative to the longitudinal axis of the coating agent line, which sealing edge (6, 7) rests, in operation, against the inner wall (15) of the coating agent line, and in that the sealing lip (4, 5) is configured such that the sealing edge (6, 7) is forced by the pressure of a pushing medium located in the coating agent line against the inner wall (15) of the coating agent line.
  7. The pig (1) according to claim 6, characterised in that the sealing lip (4, 5) is configured such that the contact pressure acting on the sealing lip (4, 5) increases as the pressure of the pushing medium rises and decreases as the pressure of the pushing medium falls.
  8. The pig (1) according to at least one of the preceding claims, characterised in that the sealing lip (4, 5) is configured such that, in the event of movement of the pig (1) in the coating agent line in the direction of the sealing lip (4, 5), the sealing lip (4, 5) is forced against the inner wall of the coating agent line by the frictional force acting between the sealing lip (4, 5) and the inner wall (15) of the coating agent line.
  9. The pig (1) according to at least one of claims 6 to 8, characterised in that the sealing edge (6, 7) is defined on the side facing the free end of the sealing lip (4, 5) by a transitional surface (8, 9) which forms an angle of between 25° and 65° with the inner wall (15) of the coating agent line.
  10. The pig (1) according to at least one of claims 6 to 9, characterised in that the sealing edge (6, 7) is defined on the side facing away from the free end of the sealing lip (4, 5) by a transitional surface (10, 11) which forms an angle of between 10° and 60° with the inner wall of the coating agent line.
  11. The pig (1) according to at least one of the preceding claims, characterised in that the main body (2) has a stop buffer (12, 13) at at least one of its two end faces, which buffer projects axially beyond the sealing lip (4, 5).
  12. The pig (1) according to claim 11, characterised in that the stop buffer (12, 13) is arranged centrally on at least one end face of the main body (2).
  13. The pig (1) according to at least one of the preceding claims, characterised in that the main body (2) and/or the sealing lip (4, 5) and/or the stop buffer (12, 13) consists of an elastomer.
  14. The pig (1) according to at least one of the preceding claims, characterised in that the main body (2) and/or the sealing lip (4, 5) and/or the stop buffer (12, 13) consists of a material which is resistant to water-based paint and/or solvent.
  15. The pig (1) according to any one of the preceding claims, characterised in that the marker (14) is formed on the stop buffer (13).
  16. A coating installation comprising at least one coating agent line (15) and one pig (1) according to at least one of the preceding claims arranged in the coating agent line.
  17. A method of producing a pig (1) according to at least one of the preceding claims, in which the main body (2) is formed in one piece with the sealing lip (4, 5) and is injection-moulded around the signal transmitter (3), characterised in that a tactile and/or visible marker (14) is formed on the main body (2) and/or on a stop buffer (12, 13), which marker (14) indicates the spatial orientation of the signal transmitter (3) in the main body (2).
EP20040000640 2003-01-20 2004-01-14 Pig Expired - Lifetime EP1439344B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP20040000640 EP1439344B1 (en) 2003-01-20 2004-01-14 Pig

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
DE10301942 2003-01-20
DE10301942A DE10301942A1 (en) 2003-01-20 2003-01-20 Apparatus for conveying liquid paint from a cannister through a supply line to an electrostatic applicator, comprises first and second pigs, the movement of which from first station to second station delivers solvent to applicator
EP03010195 2003-05-06
EP03010195A EP1362641B1 (en) 2002-05-07 2003-05-06 Method and apparatus for delivering paint to an applicator and flushing same
EP20040000640 EP1439344B1 (en) 2003-01-20 2004-01-14 Pig

Publications (3)

Publication Number Publication Date
EP1439344A2 EP1439344A2 (en) 2004-07-21
EP1439344A3 EP1439344A3 (en) 2006-05-17
EP1439344B1 true EP1439344B1 (en) 2011-04-27

Family

ID=32600543

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20040000640 Expired - Lifetime EP1439344B1 (en) 2003-01-20 2004-01-14 Pig

Country Status (1)

Country Link
EP (1) EP1439344B1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3087362B1 (en) * 2018-10-19 2022-12-16 Exel Ind FLUID PROJECTION INSTALLATION AND METHOD FOR DISPLACEMENT OF AN ASSOCIATED FLUID

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3511260A1 (en) * 1985-03-28 1986-10-02 Detlev 4455 Wietmarschen Meiners Gasket for pipeline pigs
US4638278A (en) * 1986-01-14 1987-01-20 Halliburton Company Magnetic detector apparatus
DE3920981A1 (en) 1989-06-27 1991-01-10 Ist Molchtechnik Gmbh PIPING PIG
DE59809327D1 (en) * 1997-07-03 2003-09-25 Lactec Gmbh Painting device
DE19961271A1 (en) * 1999-12-18 2001-07-05 Duerr Systems Gmbh Painting device
DE10033986A1 (en) * 2000-07-13 2002-01-24 Duerr Systems Gmbh Process for using a pig in a coating installation and pig therefor
DE10240072B4 (en) 2002-08-30 2005-11-24 Dürr Systems GmbH Pig for conveying a coating material and process for its preparation

Also Published As

Publication number Publication date
EP1439344A2 (en) 2004-07-21
EP1439344A3 (en) 2006-05-17

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